title: Distinct B cell subpopulations differ in their genetic requirements for activation by T helper cells.
mesh_terms: D000818:Animals; D000950:Antigens, Ly; D001402:B-Lymphocytes / Q000276:immunology*; D002678:Chimera; D005802:Genes, MHC Class II; D006183:H-2 Antigens; D007116:Immunization, Passive; D066298:In Vitro Techniques; D008213:Lymphocyte Activation; D008211:Lymphocyte Cooperation; D008285:Major Histocompatibility Complex; D051379:Mice; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000950:Antigens, Ly; D006183:H-2 Antigens